package com.interviews.lock;

import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

/**
 * 题目:多线程之间按顺序调用，实现A->B->C三个线程启动，要求如下:AA打印5次，BB打E小o次，CC打印门15次
 * 紧接着
 * AA打E印5次，BB打印10次，CC打印15次
 * ......
 * 来10轮
 *
 * @author qian
 * @version 1.0
 * @date 2022/2/23 17:30
 */
class ShareResource {

    private Lock lock = new ReentrantLock();
    private volatile int number = 0;
    private Condition c1 = lock.newCondition();
    private Condition c2 = lock.newCondition();
    private Condition c3 = lock.newCondition();


    public void print5() {
        lock.lock();
        try {
            while (number != 0) {
                c1.await();
            }
            number = 1;
            for (int i = 0; i < 5; i++) {

                System.out.println(Thread.currentThread().getName() + "\t print");
            }
            c2.signal();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            lock.unlock();
        }
    }

    public void print10() {
        lock.lock();
        try {
            while (number != 1) {
                c2.await();
            }
            number = 2;
            for (int i = 0; i < 10; i++) {

                System.out.println(Thread.currentThread().getName() + "\t print");
            }
            c3.signal();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            lock.unlock();
        }
    }

    public void print15() {
        lock.lock();
        try {
            while (number != 2) {
                c3.await();
            }
            number = 0;
            for (int i = 0; i < 15; i++) {

                System.out.println(Thread.currentThread().getName() + "\t print");
            }
            c1.signal();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            lock.unlock();
        }
    }
}
/**
* @Description: 锁绑定多个条件Condition
* @author: qwj
* @date: 2022/2/24 14:37
*/
public class SyncAndReentrantLockDemo {

    public static void main(String[] args) {
        ShareResource shareResource = new ShareResource();

        new Thread(() -> {
            for (int i = 0; i < 10; i++) {

                shareResource.print5();
            }
        }, "AAA").start();

        new Thread(() -> {
            for (int i = 0; i < 10; i++) {
                shareResource.print10();
            }
        }, "BBB").start();

        new Thread(() -> {
            for (int i = 0; i < 10; i++) {
                shareResource.print15();
            }
        }, "CCC").start();
    }

}
